The PC part of it (and I would hope you please read the rest of my posts on this thread) is that a PART of the scientific community is bending over backwards while ignoring important data in attempting to prove to the world that it was in Africa that we finally became "human." This serves their agenda in two ways: 1) it makes black people the original sapient species (which might be true, but the data are not in yet) and 2) by bringing the date closer and closer to the present, they are diminishing the separation of the races (while I am not arguing for racialism, I am arguing against distorting data).
It amazes me that the same people who argue against the existence of races, always seem to pump up the importance of the non-white ones. You can't have it both ways.
And, please let me again say: there is no doubt that the line that eventually would give rise to humans arose in Africa. The battle is about when the key "Out of Africa" event occured to make us fully human.